To provide a gas exhaust system capable of suppressing supply difficulty of air into an exhaust pipe from an air supply pipe.
This gas exhaust system is provided with the exhaust pipes 14, 21, 22a, 28, 29, 30 connecting ends on one side with an engine 11, a muffler 15 in which at least a part on the other end side of the exhaust pipe is arranged in the inside, and a secondary air introducing pipe 31 connected with a part arranged in the muffler 15 of the exhaust pipe to supply air into the exhaust pipe. An axial line L2 of at least a part connected with the secondary air introducing pipe 31 of the exhaust pipes 14, 21, 22a, 28, 29, 30 is linear, end parts on the downstream side of the exhaust pipes are arranged in the muffler 15, and a purifying cylindrical part 30 for purifying exhaust gas is provided in the end part on the downstream side of the exhaust pipe.
COPYRIGHT: (C)2008,JPO&INPIT
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SUZUKI HIROMI
SHIMOISHI MANABU
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